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w in (-oo:+oo)
40 = (5/4)*w // - (5/4)*w
40-((5/4)*w) = 0
(-5/4)*w+40 = 0
40-5/4*w = 0 // - 40
-5/4*w = -40 // : -5/4
w = -40/(-5/4)
w = 32
w = 32
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